<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity5">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="/login" method="post">
        <input type="hidden" th:value="${_csrf.token}" name="_csrf" th:if="${_csrf}">
        username：<input type="text" name="username" /><br>
        password：<input type="password" name="password"/><br>
        <input type="submit" value="登录"/>
    </form>
</body>
</html>